Means ffor wiping grinding bolls



March 8, 1932. G. A. VASEL MEANS FOR WIPING GRINDING R LLS Filed Feb.14, 1930 Patented Mar. 8, 1932 UNITED STATES PATENT OFFICE GUSTAV A.VASEL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOIR. T0 WILLIAM WHARTON, JR.8: COMPANY, INCORPORATETQ OF EASTON, PENNSYLVANIA, A COR- PORATION OFPENNSYLVANIA MEANS FOR WIPING GRINDING ROLLS The object of the inventionis to enhance the efliciency and to provide economical operation ofcolor grinding machines of the type embodying co-acting grinding rolls;and the nature of the invention consists 1n the provision of means fortrapping and directing back to the grinding faces, material throwntherefrom under the action of centrifugal force. 7

One embodiment of the invention is illustrated in the accompanyingdrawings forming a part hereof, wherein Figure lis a fragmentary planview of coacting grinding rolls having trapping provisions embodying theinvention.

Fig. 2 is an end view.

Fig. 3 is a section on line 3-3 of Fig. 2.

Fig. 4: is a detail of one of the end plates.

In the drawings, the numerals 1 and 2 indicate, respectively, the lowand intermediate speed rolls of equal length as to grinding area. Asusual the mass or material to be ground is delivered into the bight ofsaid rolls through the intervention of hopper elements or end plates 3having coincident arch portions 4 overlying the trunnions of the rollsand defined by stems 5. The rolls, also as usual, rotate, respectively,in a clockwise and counter-clockwise direction. In practice and due tothe centrifugal force generated by the rolls, there is a tendency forthe material in the end zones to escape from the rolls by leakageendwise thereof. In order to obviate this and in the practice of myinvention, the end or hopper plates have abutting or wiping contact withthe end faces of the rolls and are provided on the roll side and in theplane of the grinding faces with open slots or grooves 6, one for eachroll, whose office it is to trap leakage and direct the same back intothe mass suspended in the bight of the rolls. Excellent results havebeen achieved in practice by using tapered grooves of the form moreparticularly shown in Fig. 4.

The invention is not concerned with the details of mounting the endplates which, obviously, may vary, it being suflicient to say they areadjustable to take up wear and maintain wiping contact.

Having described my invention, I claim: 1. The combination of co-actinggrinding rolls, and hopper plates coacting with the ends of such rollsfor wiping contact therewith,.the margins of the plates being formedwith grooves opening through such margins and extending tangentially ofthe adjacent adapted to overlie the roll trunnions so that the platewill bear against the ends'of a set of rolls, the plate having groovesabove the arch portions and of a width to extend above and belowthe'plane of movement of the roll surfaces, said grooves extendingtoward the bight of the rolls andeifective to trap leakage and directthe same back into the mass 'suspended into the bight of the rolls.

In testimony whereof I afiix my signature.

GUSTAV A. VASEL.

